awk - Colorize any path in command output

colorize-paths.awk

#!/usr/bin/awk -f

# colorize-path - add color to paths in specified field
# usage:
#   command | ./bin/colorize-paths
#   git ls-tree -r HEAD | ./bin/colorize-paths -v field=4
#   ls -la | ./bin/colorize-paths -v field=9
#

BEGIN {
    RED="\033[31m"
    BLUE="\033[34m"
    RESET="\033[0m"
    if (!field) field = 1  # default to field 1 if not specified
}
{
    # Store all fields before our target field
    prefix = ""
    for (i = 1; i < field; i++) {
        prefix = prefix $i (i < field-1 ? OFS : "")
    }

    # Concatenate target field and all remaining fields
    path = ""
    for (i = field; i <= NF; i++) {
        path = path $i (i < NF ? OFS : "")
    }

    # Match directories and files using split
    n = split(path, parts, "/")
    if (n > 1) {
        # Reconstruct the directory part
        dir = ""
        for (i = 1; i < n; i++) {
            dir = dir parts[i] "/"
        }
        path = BLUE dir RESET RED parts[n] RESET
    } else {
        path = RED path RESET
    }

    # Print the prefix and colorized path
    if (prefix)
        print prefix, path
    else
        print path
}